Routing request based on context path

[srikanthgoud]

Hi friends,

I configured mod_cluster with tomact7 and Apache2. I have 2 issues:

1) How to route request to tomcats based on context path. How to achieve this with mod_cluster?

    ex:-  http://localhost/Myapp - tomcat1

            http://localhost/Yourapp - tomcat2

  Is the below configuration in httpd.conf still works with mod_cluster and is it the only and correct way ?

JkMount  /Myapp/* tomcat1

JkMount  /Yourapp/* tomcat2

2) Enable and Disable context

   enabling and disabing  examples, manager etc  context's are working, but enabing and disabling our application is not working. Any configuration is required?

Thanks,

Srikanth

[jfclere]

1) If you deploy Myapp on tomcat1 and Yourapp on tomcat2 mod_cluster doesn't need any configuration.

2) That should work... The handling of webapp doesn't depend on the webapp.

[srikanthgoud]

Thanks.

2) Why disable context is not working, please let me know is anything wrong in my setup?

#mod_cluster's modules

LoadModule slotmem_module modules/mod_slotmem.so

LoadModule manager_module modules/mod_manager.so

LoadModule proxy_cluster_module modules/mod_proxy_cluster.so

LoadModule advertise_module modules/mod_advertise.so

#configure listener

Listen x.x.x.x:9999

<VirtualHost x.x.x.x:9999>

<Location /mod_cluster-manager>

  SetHandler mod_cluster-manager

        Order deny,allow

        #Deny from all

        Allow from x.x.x.x

    </Location>

    KeepAliveTimeout 60

    MaxKeepAliveRequests 0

    EnableMCPMReceive

    ManagerBalancerName mod_cluster-manager

    ServerAdvertise On

    AllowDisplay On

</VirtualHost>

   ProxyPass / balancer://mod_cluster-manager

@Tomcat

<!-- Listener for mod_cluster -->

  <Listener className="org.jboss.modcluster.container.catalina.standalone.ModClusterListener" proxyList="x.x.x.x:9999" />

  <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2">

Thanks,

Srinivas

[jfclere]

ProxyPass / balancer://mod_cluster-manager that is why the disable context isn't working...

[srikanthgoud]

Thanks Jean for quick response.

I have noticed the context is getting disabled but every time after disabling from mod_cluster manager, need to clean the browser. Is it due to cookies? Is their any configuration/flag to avoid this?

Regards,

Srinivas

[jfclere]

I don't understand... are you on the mod_cluster manager page? What is wrong?

[srikanthgoud]

Jean, Please find the details:

1) Accessed application which is on some node and I'am on some page.

2) Opened mod_cluster-manger and disabled the context.

3) And went back to the same page (step 1) accessed some links and links are opening even after disabling context.

4) I have done browser cleaning after that no pages are accessed as expected getting Not Found page.

So why I need to clean the browser after disabling context it should straight away show Not Found page?.

Regards,

Srikanth

[jfclere]

I can't tell what is wrong but my guess is that the browser is caching the content of links. Check the access_log to see if you have a request going to httpd.

[srikanthgoud]

Thanks Jean.  I will investigate this further.

  Is there a possibility in mod_cluster that context based routing like below is possible?. My requirement is not to send few requests to one server, means deploying two different applications in  two different tomcats which has same context name like MyApp.  If we are not routing based on context path the request is go to another tomcat which doesn't have that service. With load balancing we use to do the below:

Load Balancing

JkMount  /Myapp/service/* loadbalncer1

JkMount  /Myapp/*  loadbalncer2

worker.loadbalncer1.type=lb

worker.loadbalncer1.balanced_workers=tomcat1

worker.loadbalncer2.type=lb

worker.loadbalncer2.balanced_workers=tomcat2

Requirement

  /Myapp/service/* - tomcat1

  /Myapp/ - tomcat2

Thanks,

Srinivas

[jfclere]

Your example doesn't even do load-balancing....

To do something like that with mod_cluster doesn't make sense.

You can use ProxyPass /path1 balancer1 and ProxyPass /path2 balancer2 and get different balancer name in each tomcat.

[srikanthgoud]

Jean,

I have done the following, but no luck

On Webserver

ProxyPass /restServiceBalancer http://10.10.10.18/test/restservice

ProxyPass /webBalancer http://10.10.10.18/test/page

On AppServer

tomcat1:

<Listener className="org.jboss.modcluster.container.catalina.standalone.ModClusterListener"

  proxyList="10.10.10.18:9999" excludedContexts="ROOT" balancer="restServiceBalancer"/>

tomcat2:

<Listener className="org.jboss.modcluster.container.catalina.standalone.ModClusterListener"

  proxyList="10.10.10.18:9999" excludedContexts="ROOT" balancer="webBalancer"/>

didn't find any thing logs except this

[Fri Oct 17 07:40:23 2014] [warn] ENABLE: context /test is in balancer webBalancer and restServiceBalancer

Regards,

Srinivas

[rhusar]

Not sure if this

3) And went back to the same page (step 1) accessed some links and links are opening even after disabling context.

is still a concern but disabling means that it won't accept requests without sessionid (= new requests). It will handle the existing ones.

[srikanthgoud]

Yes Husar.  I observed that.

But I need to route request to different tomcats based on url for that tried below configuration, but it is not working.

On Webserver

ProxyPass /restServiceBalancer http://10.10.10.18/test/restservice

ProxyPass /webBalancer http://10.10.10.18/test/page

On AppServer

tomcat1:

<Listener className="org.jboss.modcluster.container.catalina.standalone.ModClusterListener"

  proxyList="10.10.10.18:9999" excludedContexts="ROOT" balancer="restServiceBalancer"/>

tomcat2:

<Listener className="org.jboss.modcluster.container.catalina.standalone.ModClusterListener"

  proxyList="10.10.10.18:9999" excludedContexts="ROOT" balancer="webBalancer"/>

Thanks,

Srinivas

[srikanthgoud]

Hi All,

Please find the configuration and let me know if there is anything wrong in my configuration. Still facing the same issue.

#mod_cluster's modules

LoadModule slotmem_module modules/mod_slotmem.so

LoadModule manager_module modules/mod_manager.so

LoadModule proxy_cluster_module modules/mod_proxy_cluster.so

LoadModule advertise_module modules/mod_advertise.so

#configure listener

Listen 10.10.10.10:9999

#DocumetRoot /var/www

<VirtualHost 10.10.10.10:80>

   <Directory />

  Order deny,allow

  #Deny from all

        Allow from 10.10.10.10

   </Directory>

   <Location /mc>

  SetHandler mod_cluster-manager

        Order deny,allow

  #Deny from all

        Allow from 10.10.10.10

   </Location>

</VirtualHost>

<VirtualHost 10.10.10.10:9999>

  <Directory />

  Order deny,allow

  #Deny from all

        Allow from 10.10.10.10

   </Directory>

    ProxyRequests On

    ProxyVia On

    ErrorLog logs/application_error.log

    LogLevel debug

    KeepAliveTimeout 120

    MaxKeepAliveRequests 0

    EnableMCPMReceive

    #CreateBalancers 1

    #ManagerBalancerName mod_cluster-manager

    ServerAdvertise On

    AllowDisplay On

    ProxyPass /webBalancer http://10.10.10.10/test/js

    ProxyPass /restServiceBalancer http://10.10.10.10/test/page

</VirtualHost>

<Proxy balancer://webBalancer>

     Order deny,allow

     Allow from all

     BalancerMember http://10.10.10.10:8080 route=tomcat1

</Proxy>

<Proxy balancer://restServiceBalancer>

     Order deny,allow

     Allow from all

     BalancerMember http://10.10.10.10:9090 route=tomcat2

</Proxy>

Thanks,

Srinivas

[jfclere]

ProxyPass /webBalancer http://10.10.10.10/test/js

ProxyPass /restServiceBalancer http://10.10.10.10/test/page

That looks fishy...  The tomcat are probably on port 8080 and 9090.

Additionally that looks like a static configuration without a balancer you don't need mod_cluster nor mod_balancer for that.

A simple ProxyPass should do the work.